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This image shows Meridiani Planum, the landing site for Opportunity. The yellow oval, which is 81.5 km by 11.5 km (50 by 7 miles), indicates the area within which Opportunity landed.
Click on image for full sizeWindows to the Universe original artwork by Randy Russell using images courtesy NASA/JPL.

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MER Opportunity Landing Site - Meridiani Planum

The second Mars
Exploration Rover (MER), named "Opportunity", landed at a site on Mars known
as Meridiani Planum. This flat
plain is one of the few places on Mars where the
mineral gray hematite is found
in large concentrations. On Earth, hematite deposits usually indicate that water
was present in an area for long periods. The main goal of the MER missions is
to discover and examine geologic formations
that imply the presence of water at some time. Scientists chose Meridiani
Planum as a MER landing site primarily because of the hematite deposits detected
there.

Opportunity landed within an 81.5 km long by 11.5 km wide (50 mile by 7 mile)
ellipse centered at 1.98° South latitude and 5.96° West longitude. The site
is roughly on the opposite side of the Red Planet from Gusev
Crater, the landing site of "Spirit", Opportunity's twin. Meridiani
Planum is a flat plain ("planum" means "plain") near the prime meridian
on Mars (the arbitrarily chosen location of the line of zero longitude) that
offered a safe landing site for the rover
to touch down. Opportunity bounced to a halt within the landing ellipse on January
24, 2004. The airbag ball Opportunity was encased within during landing actually ended up resting inside of a shallow, small crater that is about 20 meters (66 feet) across.

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